/* Copyright (c) 2006 by M Aamir Maniar 
 * 
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the 
 * "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, 
 * distribute, sublicense, and/or sell copies of the Software, and to 
 * permit persons to whom the Software is furnished to do so, subject to 
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * */

namespace Generic.Patterns
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Threading;
    using System.Reflection;

    public sealed class Singleton<T> where T : new()
    {
        private Singleton() {}

        public static T Instance
        {
            get
            {
                return SingletonHandler.Instance;
            }
        }

        class SingletonHandler
        {
            static readonly object _syncRoot = new object();
            
            static SingletonHandler() { }

            internal static T _instance;
            internal static T Instance
            {
                get
                {
                    if (_instance == null)
                    {
                        lock(_syncRoot)
                        {
                            if (_instance == null)
                                _instance = new T();
                        }
                    }
                    return _instance;
                }
            }
        }
    }
}
